Chin strap for helmet



FIG. 1 is a front, top and right side perspective view of a chin strap for helmet showing my new design;

FIG. 2 is a front view thereof, the rear view being a mirror image of FIG. 2.

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is an enlarged right side view thereof; and,

FIG. 6 is an enlarged left side view thereof.

The broken lines illustrate portions of the chin strap for helmet and form no part of the claimed design. 

CLAIM The ornamental design for a chin strap for helmet, as shown and described. 